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   <div id="projectname">Hybrid Calculator
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   <div id="projectbrief">Homework3 of D.S.A. Design a four-rule hybrid calculator.</div>
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<div class="title">main.cpp</div>  </div>
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<a href="a00002.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160; </div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="preprocessor">#include &lt;iostream&gt;</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="preprocessor">#include &lt;stack&gt;</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="preprocessor">#include &lt;queue&gt;</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="preprocessor">#include &lt;string&gt;</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="preprocessor">#include &lt;algorithm&gt;</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160; </div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="keyword">using namespace </span>std;</div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160; </div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160; </div>
<div class="line"><a name="l00022"></a><span class="lineno"><a class="line" href="a00002.html#ac006ef50ae5c9517970fdec10d0d7e7a">   22</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="a00002.html#ac006ef50ae5c9517970fdec10d0d7e7a">report_Error</a>(){</div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;    std::cout &lt;&lt; <span class="stringliteral">&quot;Error. The expression is illegal.&quot;</span> &lt;&lt; std::endl;</div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;    exit(0);</div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;}</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160; </div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160; </div>
<div class="line"><a name="l00032"></a><span class="lineno"><a class="line" href="a00002.html#a589bcd938c8649eb74d23c687a923fc0">   32</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="a00002.html#a589bcd938c8649eb74d23c687a923fc0">report_Error_zero</a>(){</div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;    std::cout &lt;&lt; <span class="stringliteral">&quot;Error. One of the divisors in the expression is 0.&quot;</span> &lt;&lt; std::endl;</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;    exit(0);</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;}</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160; </div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160; </div>
<div class="line"><a name="l00044"></a><span class="lineno"><a class="line" href="a00002.html#acd83053f5df5d01d3fce0cd5e9c1dc21">   44</a></span>&#160;<span class="keywordtype">int</span> <a class="code" href="a00002.html#acd83053f5df5d01d3fce0cd5e9c1dc21">Precedence</a>(<span class="keywordtype">char</span> op) {       <span class="comment">//Check! Works!</span></div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;    <span class="keywordflow">if</span> (op == <span class="charliteral">&#39;+&#39;</span> || op == <span class="charliteral">&#39;-&#39;</span>)</div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;        <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;    <span class="keywordflow">if</span> (op == <span class="charliteral">&#39;*&#39;</span> || op == <span class="charliteral">&#39;/&#39;</span>)</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;        <span class="keywordflow">return</span> 2;</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;    <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;}</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160; </div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160; </div>
<div class="line"><a name="l00061"></a><span class="lineno"><a class="line" href="a00002.html#a819fed027eb44c4137567e0ff82206e3">   61</a></span>&#160;<span class="keywordtype">double</span> <a class="code" href="a00002.html#a819fed027eb44c4137567e0ff82206e3">calculate</a>(<span class="keywordtype">double</span> num_1, <span class="keywordtype">double</span> num_2, <span class="keywordtype">string</span> op) { <span class="comment">//Check!  Works!</span></div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;    <span class="keywordflow">if</span> (op == <span class="stringliteral">&quot;+&quot;</span>) <span class="keywordflow">return</span> num_1 + num_2;</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;    <span class="keywordflow">if</span> (op == <span class="stringliteral">&quot;-&quot;</span>) <span class="keywordflow">return</span> num_1 - num_2;</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;    <span class="keywordflow">if</span> (op == <span class="stringliteral">&quot;*&quot;</span>) <span class="keywordflow">return</span> num_1 * num_2;</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;    <span class="keywordflow">if</span> (op == <span class="stringliteral">&quot;/&quot;</span>) {</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;        <span class="keywordflow">if</span> (num_2 == 0) <a class="code" href="a00002.html#a589bcd938c8649eb74d23c687a923fc0">report_Error_zero</a>();  </div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;        <span class="keywordflow">return</span> num_1 / num_2;</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;    }</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;    <span class="keywordflow">else</span>{</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;        <a class="code" href="a00002.html#ac006ef50ae5c9517970fdec10d0d7e7a">report_Error</a>();</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;    }</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;}</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160; </div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160; </div>
<div class="line"><a name="l00081"></a><span class="lineno"><a class="line" href="a00002.html#a0ff92f1f9adb92e5dd15180d26eb99c9">   81</a></span>&#160;std::string <a class="code" href="a00002.html#a0ff92f1f9adb92e5dd15180d26eb99c9">remove_Invalid_Chars</a>(<span class="keyword">const</span> std::string&amp; input) {    <span class="comment">//Check! Works!</span></div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;    std::string validChars = <span class="stringliteral">&quot;0123456789.+-*/() &quot;</span>;</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;    std::string infix;</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;    std::copy_if(input.begin(), input.end(), std::back_inserter(infix), [&amp;](<span class="keywordtype">char</span> ch) { return validChars.find(ch) != std::string::npos; });</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;    <span class="keywordflow">return</span> infix;</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;}</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160; </div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160; </div>
<div class="line"><a name="l00097"></a><span class="lineno"><a class="line" href="a00002.html#abdf3fd66dae67912aae12fdd66498bd0">   97</a></span>&#160;std::queue&lt;std::string&gt; <a class="code" href="a00002.html#abdf3fd66dae67912aae12fdd66498bd0">Infix_To_Postfix</a>(<span class="keyword">const</span> std::string&amp; infix) { <span class="comment">//Check!  Works!</span></div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;    </div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;    std::queue&lt;std::string&gt; postfix_Queue;  </div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;    std::stack&lt;char&gt; op_Stack;              </div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;    std::string tem_Number;                 </div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;    <span class="keywordtype">bool</span> Number_found   = <span class="keyword">false</span>;            </div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;    <span class="keywordtype">bool</span> Point_found    = <span class="keyword">false</span>;            </div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;    <span class="keywordtype">bool</span> Operator_found = <span class="keyword">false</span>;            </div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;    <span class="keywordtype">bool</span> Lbracket_found = <span class="keyword">false</span>;            </div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;    <span class="keywordtype">bool</span> Rbracket_found = <span class="keyword">false</span>;            </div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;    <span class="keywordtype">bool</span> Point_has      = <span class="keyword">false</span>;            </div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;    <span class="keywordtype">bool</span> valid_Check    = <span class="keyword">true</span>;             </div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;    <span class="keywordtype">int</span> Lbracket_Numbers = 0;               </div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;    <span class="keywordtype">int</span> Rbracket_Numbers = 0;               </div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">char</span> ch : infix) {</div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;        <span class="keywordflow">if</span> (isdigit(ch)) {              </div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;            tem_Number += ch;           </div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;            Number_found   = <span class="keyword">true</span>;      </div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;            Operator_found = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;            Lbracket_found = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;        }</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160; </div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;        <span class="keywordflow">else</span> <span class="keywordflow">if</span> (ch == <span class="charliteral">&#39;.&#39;</span>) {</div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;            <span class="keywordflow">if</span> (!Number_found || Operator_found || Point_found || Point_has) {  </div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;                valid_Check = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;                <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;            }</div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;            tem_Number += ch;</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;            Point_found  = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;            Number_found = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;            Point_has    = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;        }</div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160; </div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;        <span class="keywordflow">else</span> <span class="keywordflow">if</span> (ch == <span class="charliteral">&#39;+&#39;</span> || ch == <span class="charliteral">&#39;-&#39;</span> || ch == <span class="charliteral">&#39;*&#39;</span> || ch == <span class="charliteral">&#39;/&#39;</span>) {</div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;            <span class="keywordflow">if</span> (!Number_found || Lbracket_found) {  </div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;                valid_Check = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;                <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;            }</div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;            <span class="keywordflow">if</span> (!tem_Number.empty()) {      </div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;                postfix_Queue.push(tem_Number);</div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;                tem_Number.clear();</div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;                Number_found = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;                Point_found  = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;                Point_has    = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;            }</div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;            <span class="keywordflow">while</span> (!op_Stack.empty() &amp;&amp; op_Stack.top() != <span class="charliteral">&#39;(&#39;</span> &amp;&amp; <a class="code" href="a00002.html#acd83053f5df5d01d3fce0cd5e9c1dc21">Precedence</a>(op_Stack.top()) &gt;= <a class="code" href="a00002.html#acd83053f5df5d01d3fce0cd5e9c1dc21">Precedence</a>(ch)) {   </div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;                postfix_Queue.push(std::string(1, op_Stack.top()));</div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;                op_Stack.pop();</div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;            }</div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;            op_Stack.push(ch);</div>
<div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;            Operator_found = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;            Point_found    = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;        }</div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160; </div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;        <span class="keywordflow">else</span> <span class="keywordflow">if</span>(ch == <span class="charliteral">&#39;(&#39;</span>) {</div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;            <span class="keywordflow">if</span> (Number_found || Point_found) {  </div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;                valid_Check = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;                <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;            }</div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;            <span class="keywordflow">if</span> (!tem_Number.empty()){</div>
<div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;                postfix_Queue.push(tem_Number);</div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;                tem_Number.clear();</div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;                Number_found   = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;                Operator_found = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;            }</div>
<div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;            op_Stack.push(ch);      </div>
<div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;            Lbracket_Numbers++;     </div>
<div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;            Lbracket_found = <span class="keyword">true</span>;  </div>
<div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;        }</div>
<div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160; </div>
<div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;        <span class="keywordflow">else</span> <span class="keywordflow">if</span> (ch == <span class="charliteral">&#39;)&#39;</span>) {</div>
<div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;            <span class="keywordflow">if</span> (Operator_found || !Number_found) {    </div>
<div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;                valid_Check = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;                <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;            }</div>
<div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;            <span class="keywordflow">if</span> (!tem_Number.empty()) {</div>
<div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;                postfix_Queue.push(tem_Number);</div>
<div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;                tem_Number.clear();</div>
<div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;                Number_found = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160;            }</div>
<div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;            <span class="keywordflow">while</span> (!op_Stack.empty() &amp;&amp; op_Stack.top() != <span class="charliteral">&#39;(&#39;</span>) {    </div>
<div class="line"><a name="l00182"></a><span class="lineno">  182</span>&#160;                postfix_Queue.push(std::string(1, op_Stack.top()));</div>
<div class="line"><a name="l00183"></a><span class="lineno">  183</span>&#160;                op_Stack.pop();</div>
<div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;            }</div>
<div class="line"><a name="l00185"></a><span class="lineno">  185</span>&#160;            <span class="keywordflow">if</span> (!op_Stack.empty() &amp;&amp; op_Stack.top() == <span class="charliteral">&#39;(&#39;</span>) {</div>
<div class="line"><a name="l00186"></a><span class="lineno">  186</span>&#160;                op_Stack.pop();</div>
<div class="line"><a name="l00187"></a><span class="lineno">  187</span>&#160;                Rbracket_Numbers++;</div>
<div class="line"><a name="l00188"></a><span class="lineno">  188</span>&#160;            }</div>
<div class="line"><a name="l00189"></a><span class="lineno">  189</span>&#160;        }</div>
<div class="line"><a name="l00190"></a><span class="lineno">  190</span>&#160; </div>
<div class="line"><a name="l00191"></a><span class="lineno">  191</span>&#160;    }</div>
<div class="line"><a name="l00192"></a><span class="lineno">  192</span>&#160;        <span class="keywordflow">if</span> (Lbracket_Numbers != Rbracket_Numbers || !valid_Check) { </div>
<div class="line"><a name="l00193"></a><span class="lineno">  193</span>&#160;            <a class="code" href="a00002.html#ac006ef50ae5c9517970fdec10d0d7e7a">report_Error</a>();</div>
<div class="line"><a name="l00194"></a><span class="lineno">  194</span>&#160;        }</div>
<div class="line"><a name="l00195"></a><span class="lineno">  195</span>&#160; </div>
<div class="line"><a name="l00196"></a><span class="lineno">  196</span>&#160;        <span class="keywordflow">if</span> (!tem_Number.empty()) {  </div>
<div class="line"><a name="l00197"></a><span class="lineno">  197</span>&#160;            postfix_Queue.push(tem_Number);</div>
<div class="line"><a name="l00198"></a><span class="lineno">  198</span>&#160;        }   </div>
<div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160; </div>
<div class="line"><a name="l00200"></a><span class="lineno">  200</span>&#160;        <span class="keywordflow">while</span> (!op_Stack.empty()) { </div>
<div class="line"><a name="l00201"></a><span class="lineno">  201</span>&#160;            postfix_Queue.push(std::string(1, op_Stack.top()));</div>
<div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160;            op_Stack.pop();</div>
<div class="line"><a name="l00203"></a><span class="lineno">  203</span>&#160;        }</div>
<div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160; </div>
<div class="line"><a name="l00205"></a><span class="lineno">  205</span>&#160;        <span class="keywordflow">return</span> postfix_Queue;</div>
<div class="line"><a name="l00206"></a><span class="lineno">  206</span>&#160;}</div>
<div class="line"><a name="l00207"></a><span class="lineno">  207</span>&#160; </div>
<div class="line"><a name="l00214"></a><span class="lineno"><a class="line" href="a00002.html#ada088694e7a30f7bec22e39bc0161196">  214</a></span>&#160;<span class="keywordtype">double</span> <a class="code" href="a00002.html#ada088694e7a30f7bec22e39bc0161196">calculate_Postfix</a>(<span class="keyword">const</span> std::queue&lt;string&gt;&amp; postfix) { <span class="comment">//Check!  Works!</span></div>
<div class="line"><a name="l00215"></a><span class="lineno">  215</span>&#160; </div>
<div class="line"><a name="l00216"></a><span class="lineno">  216</span>&#160;    std::stack&lt;double&gt; result_Stack;                </div>
<div class="line"><a name="l00217"></a><span class="lineno">  217</span>&#160;    std::queue&lt;string&gt; postfix_Buffer(postfix);     </div>
<div class="line"><a name="l00219"></a><span class="lineno">  219</span>&#160;    <span class="keywordflow">while</span> (!postfix_Buffer.empty()) {      </div>
<div class="line"><a name="l00220"></a><span class="lineno">  220</span>&#160;        </div>
<div class="line"><a name="l00221"></a><span class="lineno">  221</span>&#160;        std::string Buffer = postfix_Buffer.front();</div>
<div class="line"><a name="l00222"></a><span class="lineno">  222</span>&#160;        postfix_Buffer.pop();</div>
<div class="line"><a name="l00223"></a><span class="lineno">  223</span>&#160; </div>
<div class="line"><a name="l00224"></a><span class="lineno">  224</span>&#160;        <span class="keywordflow">if</span> (isdigit(Buffer[0]) || (Buffer[0] == <span class="charliteral">&#39;-&#39;</span> &amp;&amp; Buffer.length() &gt; 1)) {</div>
<div class="line"><a name="l00225"></a><span class="lineno">  225</span>&#160;            <span class="keywordtype">double</span> num = std::stod(Buffer);</div>
<div class="line"><a name="l00226"></a><span class="lineno">  226</span>&#160;            result_Stack.push(num);</div>
<div class="line"><a name="l00227"></a><span class="lineno">  227</span>&#160;        }</div>
<div class="line"><a name="l00228"></a><span class="lineno">  228</span>&#160; </div>
<div class="line"><a name="l00229"></a><span class="lineno">  229</span>&#160;        <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00230"></a><span class="lineno">  230</span>&#160;            <span class="keywordflow">if</span> (result_Stack.size() &lt; 2) { </div>
<div class="line"><a name="l00231"></a><span class="lineno">  231</span>&#160;                <a class="code" href="a00002.html#ac006ef50ae5c9517970fdec10d0d7e7a">report_Error</a>();</div>
<div class="line"><a name="l00232"></a><span class="lineno">  232</span>&#160;            }</div>
<div class="line"><a name="l00233"></a><span class="lineno">  233</span>&#160;            <span class="keywordtype">double</span> num_2 = result_Stack.top();  </div>
<div class="line"><a name="l00234"></a><span class="lineno">  234</span>&#160;            result_Stack.pop();</div>
<div class="line"><a name="l00235"></a><span class="lineno">  235</span>&#160;            <span class="keywordtype">double</span> num_1 = result_Stack.top();</div>
<div class="line"><a name="l00236"></a><span class="lineno">  236</span>&#160;            result_Stack.pop();</div>
<div class="line"><a name="l00237"></a><span class="lineno">  237</span>&#160;            result_Stack.push(<a class="code" href="a00002.html#a819fed027eb44c4137567e0ff82206e3">calculate</a>(num_1, num_2, Buffer));</div>
<div class="line"><a name="l00238"></a><span class="lineno">  238</span>&#160;        }</div>
<div class="line"><a name="l00239"></a><span class="lineno">  239</span>&#160;    }</div>
<div class="line"><a name="l00240"></a><span class="lineno">  240</span>&#160; </div>
<div class="line"><a name="l00241"></a><span class="lineno">  241</span>&#160;    <span class="keywordflow">if</span> (result_Stack.size() != 1) {</div>
<div class="line"><a name="l00242"></a><span class="lineno">  242</span>&#160;        <a class="code" href="a00002.html#ac006ef50ae5c9517970fdec10d0d7e7a">report_Error</a>();                   </div>
<div class="line"><a name="l00243"></a><span class="lineno">  243</span>&#160;    }</div>
<div class="line"><a name="l00244"></a><span class="lineno">  244</span>&#160;    <span class="keywordflow">return</span> result_Stack.top();</div>
<div class="line"><a name="l00245"></a><span class="lineno">  245</span>&#160;}</div>
<div class="line"><a name="l00246"></a><span class="lineno">  246</span>&#160; </div>
<div class="line"><a name="l00247"></a><span class="lineno">  247</span>&#160; </div>
<div class="line"><a name="l00248"></a><span class="lineno"><a class="line" href="a00002.html#ae66f6b31b5ad750f1fe042a706a4e3d4">  248</a></span>&#160;<span class="keywordtype">int</span> <a class="code" href="a00002.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>() {</div>
<div class="line"><a name="l00249"></a><span class="lineno">  249</span>&#160; </div>
<div class="line"><a name="l00250"></a><span class="lineno">  250</span>&#160;    std::string input;</div>
<div class="line"><a name="l00251"></a><span class="lineno">  251</span>&#160;    std::getline (std::cin, input);  </div>
<div class="line"><a name="l00253"></a><span class="lineno">  253</span>&#160;    std::string infix = <a class="code" href="a00002.html#a0ff92f1f9adb92e5dd15180d26eb99c9">remove_Invalid_Chars</a> (input); <span class="comment">//Check!  Works!</span></div>
<div class="line"><a name="l00254"></a><span class="lineno">  254</span>&#160; </div>
<div class="line"><a name="l00255"></a><span class="lineno">  255</span>&#160;    std::queue&lt;string&gt; postfix = <a class="code" href="a00002.html#abdf3fd66dae67912aae12fdd66498bd0">Infix_To_Postfix</a> (infix);</div>
<div class="line"><a name="l00256"></a><span class="lineno">  256</span>&#160; </div>
<div class="line"><a name="l00257"></a><span class="lineno">  257</span>&#160;    <span class="keywordtype">double</span> result = <a class="code" href="a00002.html#ada088694e7a30f7bec22e39bc0161196">calculate_Postfix</a>(postfix);</div>
<div class="line"><a name="l00258"></a><span class="lineno">  258</span>&#160;    cout &lt;&lt; result &lt;&lt; endl;</div>
<div class="line"><a name="l00259"></a><span class="lineno">  259</span>&#160; </div>
<div class="line"><a name="l00260"></a><span class="lineno">  260</span>&#160;    <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00261"></a><span class="lineno">  261</span>&#160;}</div>
<div class="ttc" id="aa00002_html_a0ff92f1f9adb92e5dd15180d26eb99c9"><div class="ttname"><a href="a00002.html#a0ff92f1f9adb92e5dd15180d26eb99c9">remove_Invalid_Chars</a></div><div class="ttdeci">std::string remove_Invalid_Chars(const std::string &amp;input)</div><div class="ttdoc">Remove invalid characters from the input.</div><div class="ttdef"><b>Definition:</b> <a href="a00002_source.html#l00081">main.cpp:81</a></div></div>
<div class="ttc" id="aa00002_html_a589bcd938c8649eb74d23c687a923fc0"><div class="ttname"><a href="a00002.html#a589bcd938c8649eb74d23c687a923fc0">report_Error_zero</a></div><div class="ttdeci">void report_Error_zero()</div><div class="ttdoc">If a divisor in the expression is 0, then gives a error message and ends the program.</div><div class="ttdef"><b>Definition:</b> <a href="a00002_source.html#l00032">main.cpp:32</a></div></div>
<div class="ttc" id="aa00002_html_a819fed027eb44c4137567e0ff82206e3"><div class="ttname"><a href="a00002.html#a819fed027eb44c4137567e0ff82206e3">calculate</a></div><div class="ttdeci">double calculate(double num_1, double num_2, string op)</div><div class="ttdoc">Calculate the result of the operation of two numbers.</div><div class="ttdef"><b>Definition:</b> <a href="a00002_source.html#l00061">main.cpp:61</a></div></div>
<div class="ttc" id="aa00002_html_abdf3fd66dae67912aae12fdd66498bd0"><div class="ttname"><a href="a00002.html#abdf3fd66dae67912aae12fdd66498bd0">Infix_To_Postfix</a></div><div class="ttdeci">std::queue&lt; std::string &gt; Infix_To_Postfix(const std::string &amp;infix)</div><div class="ttdoc">Converts an infix expression to a suffix expression.</div><div class="ttdef"><b>Definition:</b> <a href="a00002_source.html#l00097">main.cpp:97</a></div></div>
<div class="ttc" id="aa00002_html_ac006ef50ae5c9517970fdec10d0d7e7a"><div class="ttname"><a href="a00002.html#ac006ef50ae5c9517970fdec10d0d7e7a">report_Error</a></div><div class="ttdeci">void report_Error()</div><div class="ttdoc">If the expression is illegal, then gives a error message and ends the program.</div><div class="ttdef"><b>Definition:</b> <a href="a00002_source.html#l00022">main.cpp:22</a></div></div>
<div class="ttc" id="aa00002_html_acd83053f5df5d01d3fce0cd5e9c1dc21"><div class="ttname"><a href="a00002.html#acd83053f5df5d01d3fce0cd5e9c1dc21">Precedence</a></div><div class="ttdeci">int Precedence(char op)</div><div class="ttdoc">Determine the priority of the operator.</div><div class="ttdef"><b>Definition:</b> <a href="a00002_source.html#l00044">main.cpp:44</a></div></div>
<div class="ttc" id="aa00002_html_ada088694e7a30f7bec22e39bc0161196"><div class="ttname"><a href="a00002.html#ada088694e7a30f7bec22e39bc0161196">calculate_Postfix</a></div><div class="ttdeci">double calculate_Postfix(const std::queue&lt; string &gt; &amp;postfix)</div><div class="ttdoc">Calculates the value of the postfix expression.</div><div class="ttdef"><b>Definition:</b> <a href="a00002_source.html#l00214">main.cpp:214</a></div></div>
<div class="ttc" id="aa00002_html_ae66f6b31b5ad750f1fe042a706a4e3d4"><div class="ttname"><a href="a00002.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a></div><div class="ttdeci">int main()</div><div class="ttdef"><b>Definition:</b> <a href="a00002_source.html#l00248">main.cpp:248</a></div></div>
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